Study on luminescence characteristics of blue OLED with phosphor-doped host-guest structure

Abstract

In this study, we design and fabricate phosphor-doped host-guest structure organic light-emitting diodes (OLEDs), where the blue-ray iridium complex electrophosphorescent material FIrpic acts as object material. Properties of the device can be accommodated by changing the host materials, dopant concentration and thickness of the light-emitting layer. The study shows that the host material N,N'-dicarbazolyl-3,5-benzene (mCP) has a higher triplet excited state energy level, which can effectively prevent FIrpic triplet excited state energy backtracking to host material, thus the luminous efficiency is improved. When mCP is selected as the host material, the thickness of the light-emitting layer is 30 nm and the dopant concentration is 8 wt%, the excitons can be effectively confined in the light-emitting region. As a result, the maximum current efficiency and the maximum brightness of the blue device can reach 15.5 cd/A and 7 196.3 cd/m², respectively.

References

[1] SmithJ, BawolekE, LeeY K, O'BrienB, MarrsM, HowardE, StrnadM, ChristenJ B, GoryllM. Electronics Letters, 2015, 51: 1312

[2] MizukamiM, OkuS, ChoS I, TatetsuM, AbikoM, MamadaM, SakanoueT, SuzuriY, KidoJ, TokitoS. IEEE Electron Device Letters, 2015, 36: 841

[3] ChenY, WangJ, ZhongZ, JiangZ, SongC, HuZ, PengJ, WangJ, CaoY. Organic Electronics, 2016, 37: 458

[4] SmithJ T, KatchmanB A, KullmanD E, ObahiagbonU, LeeY K, O'BrienB P, RauppG B, AndersonK S, ChristenJ B. Journal of Display Technology, 2016, 12: 273

[5] KasaharaT, KuwaeH, KobayashiN, NoboriA, OshimaJ, ShojiS, MizunoJ. Journal of Photopolymer Science and Technology, 2017, 30: 467

[6] ChenY H, ChenJ S, ZhaoY B, MaD G. Applied Physics Letters, 2012, 100: 114

[7] BaldoM A, O'brienD F, YouY, ShoustikovA, SibleyS, ThompsonM E, ForrestS R. Nature, 1998, 395: 151

[8] ZhaoZ, YuG, ChangQ, LiuX, LiuY, WangL, LiuZ, BianZ, LiuW, HuangC. Journal of Materials Chemistry C, 2017, 5: 7344

[9] DongQ, TaiF, LianH, ChenZ, HuM, HuangJ, WongW Y. Dyes and Pigments, 2017, 143: 470

[10] ChenY, WeiX, CaoJ, HuangJ, GaoL, ZhangJ, SuJ, TianH. ACS Applied Materials & Interfaces, 2017, 9: 14112

[11] LiX L, OuyangX, ChenD, CaiX, LiuM, GeZ, CaoY, SuS J. Nanotechnology, 2016, 27: 124001

[12] RagniR, MaioranoV, PuglieseM, MaggioreA, OrselliE, BabudriF, GigliG, ColaL D, FarinolaG M. Synthetic Metals, 2017, 227: 148

[13] MiaoY, WangK, ZhaoB, GaoL, TaoP, LiuX, HaoY, WangH, XuB, ZhuF. Nanophotonics, 2018, 7: 295

[14] DingL, DongS C, JiangZ Q, ChenH, LiaoL S. Advanced Functional Materials, 2015, 25: 645

[15] HolmesR J, ForrestS R, TungY J, KwongR C, BrownJ J, GaronS, ThompsonM E. Applied Physics Letters, 2003, 82: 2422

[16] ClementiC, MilianiC, VerriG, SotiropoulouS, RomaniA, BrunettiB G, SgamellottiA. Applied Spectroscopy, 2009, 63: 1323

[17] KalinowskiJ, GiroG, CocchiM, FattoriV, MarcoP D. Applied Physics Letters, 2000, 76: 2352

[18] TokitoS, IijimaT, SuzuriY, KitaH, TsuzukiT, SatoF. Applied Physics Letters, 2003, 83: 569

Just Accepted

This article has successfully passed peer review and final editorial review, and will soon enter typesetting, proofreading and other publishing processes. The currently displayed version is the accepted final manuscript. The officially published version will be updated with format, DOI and citation information upon launch. We recommend that you pay attention to subsequent journal notifications and preferentially cite the officially published version. Thank you for your support and cooperation.